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Anti markovnikov's addition takes place ...

Anti markovnikov's addition takes place in the presence of

A

`HBr`

B

`HBr//C_(6)H_(5)COOH`

C

`(C_(6)H_(5)CO)O_(2)H//HBr`

D

`HBr//C_(6)H_(5)OH`

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To answer the question about what facilitates Anti-Markovnikov's addition, we can break it down into a few steps. ### Step-by-Step Solution: 1. **Understanding Anti-Markovnikov's Addition**: - Anti-Markovnikov's addition refers to the addition of HX (where X is a halogen) to an alkene, where the hydrogen atom adds to the carbon with the greater number of hydrogen atoms (the less substituted carbon), and the halogen adds to the carbon with fewer hydrogen atoms (the more substituted carbon). 2. **Conditions for Anti-Markovnikov's Addition**: - This type of addition typically occurs in the presence of certain reagents or catalysts that promote this pathway instead of the Markovnikov addition. 3. **Identifying the Key Reagent**: - The most common condition for Anti-Markovnikov's addition is the presence of **peroxides** (ROOR). Peroxides are compounds that contain a peroxide group (-O-O-). 4. **Mechanism of the Reaction**: - In the presence of peroxides, the reaction proceeds via a free radical mechanism. The peroxide initiates the formation of free radicals, which leads to the addition of H and X in an anti-Markovnikov fashion. 5. **Conclusion**: - Therefore, Anti-Markovnikov's addition takes place in the presence of **peroxides**. ### Final Answer: Anti-Markovnikov's addition takes place in the presence of **peroxides**.
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